# X-ray absorption study of the ferromagnetic Cu moment at the ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7}/{\mathrm{La}}_{2/3}{\mathrm{Ca}}_{1/3}{\mathrm{MnO}}_{3}$ interface and variation of its exchange interaction with the Mn moment

• Sen, Kaushik University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
• Perret, Edith University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
• Alberca, Aurora University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland - Swiss Light Source, Paul Scherrer Institut, Villigen PSI, Switzerland
17.05.2016
Published in:
• Physical Review B. - 2016, vol. 93, no. 20, p. 205131
English With x-ray absorption spectroscopy and polarized neutron reflectometry we studied how the magnetic proximity effect at the interface between the cuprate high-TC superconductor YBa2Cu3O7 (YBCO) and the ferromagnet La2/3Ca1/3MnO3 (LCMO) is related to the electronic and magnetic properties of the LCMO layers. In particular, we explored how the magnitude of the ferromagnetic Cu moment on the YBCO side depends on the strength of the antiferromagnetic (AF) exchange coupling with the Mn moment on the LCMO side. We found that the Cu moment remains sizable if the AF coupling with the Mn moments is strongly reduced or even entirely suppressed. The ferromagnetic order of the Cu moments thus seems to be intrinsic to the interfacial CuO2 planes and related to a weakly ferromagnetic intraplanar exchange interaction. The latter is discussed in terms of the partial occupation of the Cu 3d3z2−r2 orbitals, which occurs in the context of the so-called orbital reconstruction of the interfacial Cu ions.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
• English
Classification
Physics